Microsoft has released a video showing off some of the features coming to Windows 8.1. I must say, the new features all look like great additions (the new search looks awesome), but I'm much more interested in performance - the huge bottleneck for anything related to Metro. In addition, as part of the Windows 8.1 update, Windows RT users will get an ARM version of Outlook. Not that I care, but I'm sure some business users do.